In this appendix we rederive the allowed pairs of Coulomb branch dimensions for rank-two \({\cal N}=2\)  SCFTs, which will be necessary data for our rank-two scan. We begin by noting that, based solely on the fact that CB monodromies must take values in the discrete group \(Sp(2r,{\mathbb {Z}})\) , the allowed scaling dimensions of Coulomb branch operators are constrained to take values in [1]}, [2]}:
\({\Delta }\in \left\lbrace \frac{n}{m}\,\Big |\,\,n,m \in \mathbb {N},\,0<m\le n,\,{\rm gcd}(n,m)=1,\,\varphi (n)\le 2r\right\rbrace ~,\) 
